Method of and means for extending the usable condition of metallio dies and tools



the following specification.

This invention mint ctivo to} for many yours u s o 5 H and othea'wiso inn" pncit .9 wist for a 10m: 7 samctiw facts,- fio which 23m 1 1:" oz menu,

sin} tools 1*.

resoo; he? 3.1M

52. My own 0x1;o1i111o;.33.3 were Glrectoi by what 131mm any the maflo oi tho 6513 may be maintainei in usable o0 longer period than heretoioye. to the discovery, that dies other similar tools "for drop forging, 11 0:111- ingz and otherwise shaping of metaiiio parts, W1 11, and do. wfi-hsand the destructive Wiili bottom and for a r: 'aoh greater Xongth of tfimo, i? they are :1 5122.133 lnznxiouigm and Impi; foeu'ied w loiie 21m" am being; us: l, 11% a 'imilpm'at-uro abovo Um, mtv mi temporatm'o m1 lmver than Coat upphod thereto in the hmfloafiingg prooosa Roughly king .this tomq'mm giuo at which izh dies 01' book are in b :kopt during their pm'iods of active use 'fi'fiflfl about 300 to about 1100 F, the oo the kempomtmio :12: which R die or tooi is to ho kopk depemfing on the chm'aoteris zirs of the stee or alloy, of I which the die, 001 43%., is mach. The tools or dies; made of some pm'fiiouim'ly compoimdwbsiod am! sieo! afloys, may have in 1w WW! "so, mu? kopfs at; :1 yet higher stated maximum no x'me that tile iom'pemm "ilill} lower to boom-sting; *zu'bon tool et forgin g 4 t M6 7 11? .g from 9.75 :flnom and. which we ixeaco. to MOO I JZ' F for hardening whose mpeyiing heat does no; emod '?50 E, a

. "@Q of mnghuoss and. resistant capacity imparted to die, 0; E00 1, pro- .amm; of such a straight car?) 11 steel, by outing lilo and lee-ping it While ii; is a uswh at a tampomi uro from about 0 {o 660' P1 no further rulo being, in {his ins-mave that tho fighter the (hopping woi i of the, miu'hioo, in Whivh the die or $00 is raving 212211, or tho fighter the sork and the m'xsim No me flows, of which the drop forging; 2o produced, the nearer to the s v til lower E'mx'zt 0'5? the temperature the (110 Hwy ho Moog-13. and kept. I found who Hm: it is EIZQFQFRMGU) heat and keep H10 $0015 or divs. nmdo 05 straight carbon siw'is, 21'? a lower Imnperzz mo than tools 91' (Nos mzuao of filmy stools, bovauso the continuous app ntion to the straight carbon tool swds of :1 tm'rzporatm'e more? to that to \vhie'h they 2:10 heated in the hardening provvss will rosuii: in reducing their hardnoos;

Dies, or todis, made of: sieeis alloyed with chrome nickel, .fm'bon chromium,[chrome 'nnadium, cobalt d'uomium, tungsten m" molfmionum, W11 in some cases scarcely be affovtod by fimnpm-utm'os mnging up {to heated 1100 l This applies, for instance, to a tungsten high speed steel of approximately the following composition: 0, 0.65; W 10.00; (Jr, 3.40; V, 0.80%. Tools, or dies, made of the so-called tungsten high speed steel of this or similar composition for heavy forging, trimming and blanking will stand a much longer service if heated to 1100" F., and kept-at that temperature while they are being used. The period of their usable condition may bemore than doubled thereby. Tools, or dies, made of cheaper grades of high speed steels, without any tungsten, for instance, a patented c0baltchromium combination, containing about C, 1.50; Co, 3.25; be kept at a temperature of about 850 F.

without losing the required degree of their hardness.

Dies for hydraulic pression work, as well blanking, made of approximately C, 0.45; W, 2.00; Cr, 1.00; Si, 0.80 it heated to about 500 F. and dies and tools for hot trimming. drop forging and hot or cold bolt heading. produced of steel containing about C, 0.90; Mn, 0.40; Cr, 3.50: Si, 0.20%, will have likewise their usable condition maintained for a much longer period if heated to about 750 F. and kept at'that temperature while they are being used.

The heating of these tools and dies and maintaining them so heated while being used, may be effected in various ways. One method that I have found to serve well for all.temperatures, and may be said to be perhaps the simplest and 'most inexpensive means, is to appl to the die, or tool, a jacket tightly packed with intusorial earth in a layer of suitable thickness. and then heating it by gas burners. In this way the die or tool will be heated uniformly, andthen kept at, or very near, the requisite tem perature, for many hours. Fine molding sand mav be used instead of the intusorial earth. heating apparatus may be employed.

\Vhere it is more convenient, and the die or tool does not require to be heated. above 000 ll, an. oil bath may take the place of bulldozing and cornas hot trnnmlng and temperatures being Cr, 12.00; \lo, 0.75%, may:

alloy steels containing r, any approved form of electrical the packing of infusorial earth; or a bath. of molten lead or a combination of lead and tin may be used. In this connection it is well to note that a compound of 14 parts of lead with 8 parts of tin melts at about 420 F., and a combination of 38 parts of lead with 8 parts of tin at about 510 F., these required more frequently, and the molten condition of these compounds serving to indicate the tempera ture of the die or tool.

The heating of the tool or die and the heat of the packing, or bath, are controlled by a suitable heat measuring instrument set in a recess in the die or tool, in the packing, or in the bath, and provision may be made for continuously indicating the temperature of the dies or tools by providing suitable temperature indicating instruments therefor. V

I claim as my invention:

1. The method of extending the period of usable condition of a metallic die or tool, which consists in artificially heating the die or tool above the temperature naturally 'resultingt'rom the use of the die or tool and below the temperature to which it was sul jected in the hardening process, and keeping the die or tool at such temperature while it is being used.

2. The method of extending usable condition of a metallic die or tool, which consists in artifically heating the die or tool to a temperature which will not impair its hardness but above the temperature naturally resulting from the use of the die or tool, and keeping the die or tool at such temperature while it is being used.

The combination with a metallic die, or tool, of means for heating it, and for keeping it so heated while the die, or tool, is being used.

The combination with a metallic die, or tool, of means for heating it and of a pack ing for keeping it heated while the die or tool is being used HELLMUTH REINHARDT ROSENBAUM,

\Vitnesses:

CHARLES S. SKINNER, (lrnmno'rrn J. VVATTON.

the period of i 

